for some time now I am experiencing a clunking noise on my '90 XJS V12 when hitting pot holes etc. Searching the archives I thought the transmission mount to be the culprit. I today jacked up the car and found that the distance between the lower tie plate and the main carriage is less than a 1/4". So when I push the transmission up the tie plate almost immediately hits the carriage. I then disassembled the mount. After taking off the bottom nut and removing the tie plate I could see (looking up) the bottom end of the rubber bush and inside a spacer. Taking the spacer out I found a rounded washer. After taking off the main carrier bracket I found a spring (color coded violet and green) with plastic spring cups on both ends. The spring measured 4-4.5 inches (it is kind of crooked) unloaded including the two spring cups.
The rubber centre bush looks like new and I assume somebody replaced that in the past.
Am I correct in assuming that the bouncing space for the tie plate is too low and thus causing the clunk?
Is there any part missing? I studied the parts manual and I could not find the spacer and I am not sure if part #19 is the rounded washer I found or an additional washer missing on my car.
Studying the archive it seems that there his no consensus whether 1 or 2 spring cups are needed. I guess taking out 1 spring cup would lower the transmission providing more bouncing room. Correct?
Does the spring data above seem to be correct or is the spring too long?
Thanks a lot for any assistance here. I know this is a topic well discussed but unfortunately I could not find the correct answers to my questions.